StackOverflow has some pointers:

The amount of work obviously depends on what you want to change. For example, if I subclass , I can do something like this in viewDidLoad():

if let tvc = self.moreNavigationController.topViewController {
    tvc.navigationController?.navigationBar.backgroundColor = .green

That’s easy and does work. But if you want to change the text color, you’ll have to replace its source. Looks like a fair bit of trouble. Personally, I think I’d build my own TabBarController instead.

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